Naslov
Seasonal variations of phosphorus species in sediment from the middle Adriatic Sea

Autori
Matijević, Slavica ; Bojanić, Natalia ; Kušpilić, Grozdan ; Ninčević Gladan, Živana

Izvornik
Environmental Earth Sciences (1866-6280) 59 (2009), 4; 853-866

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
sediment; phosphorus species; SEDEX method; Adriatic Sea

Sažetak
Phosphorus (P) species concentrations in 0-2 cm surface sediment layer were investigated monthly from November 2001 to December 2002 at the bay, channel and open sea stations in the middle Adriatic. Modified SEDEX method was used for inorganic phosphorus species determination (P in biogenic (P-FD), authigenic (P-AUT), detrital apatite (P-DET) and P adsorbed on to iron oxides and hydroxides (P-Fe)) and organic phosphorus (P-ORG). P-FD, P-AUT and P-DET concentration ranges (1.5-5.4  mol g-1, 0-2.7  mol g-1 and 0.4-3.4  mol g-1, respectively) were similar at all stations, and showed no obvious common trend of seasonal changes. P-Fe ranged from 1.9-11.9  mol g-1 with the highest values at bay station and higher seasonal oscillations than other inorganic P forms. P-ORG ranged from 0.3-18.7  mol g-1 with higher concentrations at stations of fine-sized sediments and showed increased concentrations in warm part of the year at all stations. Correlation between concentrations of P-Fe in the surface sediment layer and orthophosphate sediment-water interface concentration gradients at bay and channel stations, indicated to P-Fe importance in the orthophosphate benthic flux. For the bay station, linkage between sediment P-ORG and Chl a concentrations, primary production and microzooplankton abundance was established, indicating a one month delay of sediment response to production fluctuations in the water column.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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